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TC1237EUNTR PDF预览

TC1237EUNTR

更新时间： 2024-11-09 13:00:35
品牌 Logo 应用领域
美国微芯 - MICROCHIP 转换器泵
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TC1237EUNTR 数据手册

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TC1235  
TC1236  
TC1237  
Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters with Shutdown  
FEATURES  
GENERAL DESCRIPTION  
ꢀ 10-Pin MSOP Package  
ꢀ Operates from 1.8V to 5.5V  
The TC1235/1236/1237 are CMOS dual inverting  
chargepumpvoltageconverterswithalowpowershutdown  
modeinMSOP10-Pinpackages. Onlyfourexternalcapaci-  
tors are required for full circuit implementation. Switching  
frequencies are 12kHz for the TC1235, 35kHz for the  
TC1236 and 125kHz for the TC1237. When the shutdown  
pin is held at a logic low, the device goes into a very low  
power mode of operation, consuming less than 1µA of  
supply current.  
These devices provide both a negative voltage inver-  
sion (available at the –VIN output), and a negative doubling  
voltage inversion (available at the –2 VIN output) with a low  
outputimpedancecapableofprovidingoutputcurrentsupto  
5mA for the –VIN output and 1mA for the –2VIN output. The  
input voltage can range from +1.8V to +5.5V.  
ꢀ Up to 5mA Output Current at –VIN Pin  
ꢀ Up to 1mA Output Current at –2VIN Pin  
ꢀꢀꢀꢀꢀPower-Saving Shutdown Mode  
ꢀ –VIN and –2VIN Outputs Available  
ꢀ Low Active Supply Current  
.......................................... 120µA (MAX) for TC1235  
.......................................... 360µA (MAX) for TC1236  
.......................................... 1.5mA (MAX) for TC1237  
ꢀ Fully Compatible with 1.8V Logic Systems  
TYPICAL APPLICATIONS  
ꢀ LCD Panel Bias  
ꢀ Cellular Phones PA Bias  
ꢀ Pagers  
ORDERING INFORMATION  
ꢀ PDAs, Portable Dataloggers  
ꢀ Battery Powered Devices  
Part No.  
Package Osc Freq (KHz) Temp Range  
TC1235EUN 10-Pin MSOP  
TC1236EUN 10-Pin MSOP  
TC1237EUN 10-Pin MSOP  
12  
35  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
125  
PIN CONFIGURATION  
TYPICAL OPERATING CIRCUIT  
10-Pin MSOP  
INPUT  
C1+  
V
+
IN  
C1  
OUTPUT 1  
C1–  
–VIN  
–V  
10  
9
1
2
C1–  
IN  
C
OUT1  
C2+  
+
+
C2+  
C1+  
TC1235  
TC1236  
TC1237  
ON  
C2  
C2–  
SHDN  
–2 V  
OFF  
TC1235  
TC1236  
TC1237  
3
4
8
7
NC  
C2–  
SHDN  
VIN  
GND  
NC  
OUTPUT 2  
IN  
C
OUT2  
+
–2 VIN  
5
6
GND  
Notes: 1) C1 and COUT1 must have a voltage rating greater  
than or equal to VIN  
2) C2 and COUT2 must have a voltage rating greater  
than or equal to 2VIN  
© 2001 Microchip Technology Inc. DS21371A  
TC1235/6/7-1 3/24/00  
1234567...10

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